I create UIViews based on xib files programmaticaly and add them to a scrollView. This works so far. If the amount changes I recreate the grid of UIViews (in my case so called theme thumbs). I remove the old ones before I recreate the new ones. The problem is the memory is never released and for every new creation memory usage piles up. Even if I remove one single thumb the memory isn´t released.
Instruments doesn´t show leaks. Dealloc in my ViewController is never called.
I use ARC and I know that I have to avoid retained references. But clearly I have used them and don´t understand where. It would be great if someone could give me a hint where I did it as I have read a lot of posts here but still don´t understand it. NSZombiesEnabled is off.
My code:
-(void)createGrid
{
for (UIView *subview in self.scrollView.subviews) {
if ([subview tag] < 10000 && ![subview isKindOfClass:[UIImageView class]]) {
[subview removeFromSuperview];
}
}
int col = 0;
int row = 0;
[self setupFetchedResultsController];
for (int i = 0; i<[[self.fetchedResultsController fetchedObjects] count]; i++)
{
col = i % THEME_COLUMNS;
row = i / THEME_COLUMNS;
ThemeThumbVC *themeThumb = [[ThemeThumbVC alloc] init];
[self.scrollView addSubview:themeThumb.view];
// configurate thumb
themeThumb.managedObjectContext = self.managedObjectContext;
themeThumb.fetchedResultsController = self.fetchedResultsController;
themeThumb.theme = [[self.fetchedResultsController fetchedObjects] objectAtIndex:i];
[themeThumb.themeThumbImage setImage:[UIImage imageWithContentsOfFile:[[[self.fetchedResultsController fetchedObjects] objectAtIndex:i] iconImageURL]]];
[themeThumb setTag:i];
[themeThumb.view setTag:i];
[themeThumb.view setFrame:CGRectMake(col*kThemeGritXOffset+(col*1), row*kThemeGritYOffset, kThemeGritXOffset+1, kThemeGritYOffset)];
[self addChildViewController:(UIViewController*) themeThumb];
}
[self.scrollView setContentSize:CGSizeMake(320, row*kThemeGritYOffset+kThemeGritYOffset)];
}